package com.chrhc.common;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
 
public class MD5Util {
	public final static String MD5(String s) {
        char hexDigits[]={'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};       

        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
	  private  final static String getMD5Str(String str) {   
	        MessageDigest messageDigest = null;   
	   
	        try {   
	            messageDigest = MessageDigest.getInstance("MD5");   
	   
	            messageDigest.reset();   
	   
	            messageDigest.update(str.getBytes("UTF-8"));   
	        } catch (NoSuchAlgorithmException e) {   
	            System.out.println("NoSuchAlgorithmException caught!");   
	            System.exit(-1);   
	        } catch (UnsupportedEncodingException e) {   
	            e.printStackTrace();   
	        }   
	   
	        byte[] byteArray = messageDigest.digest();   
	   
	        StringBuffer md5StrBuff = new StringBuffer();   
	   
	        for (int i = 0; i < byteArray.length; i++) {               
	            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)   
	                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));   
	            else   
	                md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));   
	        }   
	   
	        return md5StrBuff.toString();   
	    }   
    public static void main(String[] args) {
        System.out.println(MD5Util.MD5("111111"));
    }


}
